Abstract

We investigated ultrashort pulse filamentation and lasing action of ${{N}}_2^ +$ for pump-probe experiments in gases. Using femtosecond coherent anti-Stokes Raman scattering, the white-light supercontinuum generated in the filament was used to excite ro-vibrational Raman transitions in air, ${{\rm{CO}}_2}$ and ${{\rm{CH}}_4}$. We show that the lasing pulse acts as a probe for the excited levels by detecting the corresponding anti-Stokes Raman spectroscopy signals. This feature may be applied to remote sensing applications, as the temporal and spatial alignment of the probe beam and the filament is intrinsically provided.

© 2020 Optical Society of America

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